The first one was a great game with an interesting plot line. I will admit though that I am glad I borrowed this game from a friend instead of buying/renting it. Every city seemed to be the same thing, over and over. Jump from building to building, take the guards out, objective runs, capture the objective.
There wasn't really any replayability other than being able to kill pedestrians without being chastised. (Which I was already doing anyways

) And, there was no online feature.
Hopefully, this next game will come to be more promising. Less monotonous possible with more extras after completing the game and possibly implementation of online multiplayer. I would say co-op but, Assassin's Creed is based on a single person and it would seem strange to add another character...
I look forward to hearing more about this sequel.